---
title: Brigadier General Irvin McDowell: Commander of Union Forces at First Battle of Bull Run
author: Mathew Brady
source: https://www.worldhistory.org/image/21981/brigadier-general-irvin-mcdowell/
format: machine-readable-alternate
updated: 2026-08-11
---

# Brigadier General Irvin McDowell: Commander of Union Forces at First Battle of Bull Run

_Authored by Mathew Brady_

## Image File

[![Brigadier General Irvin McDowell: Commander of Union Forces at First Battle of Bull Run](https://www.worldhistory.org/uploads/images/21981.jpeg)](https://www.worldhistory.org/uploads/images/21981.jpeg)

## Image Caption

Brigadier General Irvin McDowell, Commander of Union forces at the the First [Battle](https://www.worldhistory.org/disambiguation/battle/) of Bull Run (First Manassas) on 21 July 1861. Photograph most likely by Mathew Brady, 1860.

Library of Congress

## Cite This Work

### APA
Brady, M. (2026, August 11). Brigadier General Irvin McDowell: Commander of Union Forces at First Battle of Bull Run. *World History Encyclopedia*. <https://www.worldhistory.org/image/21981/brigadier-general-irvin-mcdowell/>
### Chicago
Brady, Mathew. "Brigadier General Irvin McDowell: Commander of Union Forces at First Battle of Bull Run." *World History Encyclopedia*, August 11, 2026. <https://www.worldhistory.org/image/21981/brigadier-general-irvin-mcdowell/>.
### MLA
Brady, Mathew. "Brigadier General Irvin McDowell: Commander of Union Forces at First Battle of Bull Run." *World History Encyclopedia*, 11 Aug 2026, <https://www.worldhistory.org/image/21981/brigadier-general-irvin-mcdowell/>.

## License & Copyright

[![copyright source](/images/partners/wikipedia-small.png)](https://commons.wikimedia.org/wiki/File:Portrait_of_Maj._Gen._Irvin_McDowell,_officer_of_the_Federal_Army.jpg)Based on [Wikipedia](http://www.wikipedia.org/ "Wikipedia") content that has been reviewed, edited, and republished. [Original image](https://commons.wikimedia.org/wiki/File:Portrait_of_Maj._Gen._Irvin_McDowell,_officer_of_the_Federal_Army.jpg) by [**Mathew Brady**](https://commons.wikimedia.org/wiki/File:Portrait_of_Maj._Gen._Irvin_McDowell,_officer_of_the_Federal_Army.jpg). Submitted by [Joshua J. Mark](https://www.worldhistory.org/user/JPryst/ "User Page: Joshua J. Mark"), published on 11 August 2026. The copyright holder has published this content under the following license: [Public Domain](http://en.wikipedia.org/wiki/Public_domain). This item is in the public domain, and can be used, copied, and modified without any restrictions. Please note that content linked from this page may have different licensing terms.